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Old 1st December 2004, 02:31 AM   #11
BAM is offline BAM
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That driver's use is probably as the woofer on a 3 way speaker. It can match up with high-sensitivity midranges and tweeters, and the extra Xmech is so if you overdrive it, it won't bottom out, just stop going and start sounding like flub.
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Old 1st December 2004, 04:37 AM   #12
Wizard of Kelts
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It's kind of an odd duck.

Take a look at it's frequency response-very smooth, and with a notch filter you can have a crossover up to 3,500 Hz!

At first, I thought this high efficiency woofer might be made for tube fans, who need high efficiency to offset lower power. Adn I thought that the smooth midrange response might well be for high efficiency two way designs where a horn comes down to 1,000 Hz or even lower.

But then I see that it is 4 ohms. I think most tube fans like impedances higher than that.

Red line is 3 cu ft, ported, tuned to 30 Hz.

Blue line is 2.25 cu ft, sealed, Qts = 0.7

I think it is meant for high efficiency enclosures, where the builder is more interested in efficiency than small box size.
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Old 1st December 2004, 04:39 AM   #13
Wizard of Kelts
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And here is the frequency response. A notch filter could take the crossover frequency up to 3,500 Hz! For a 12. Actually, I doubt that you would want to cross over anywhere near that high.
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